| 摘要 |
PROBLEM TO BE SOLVED: To provide a ground hardening method capable of remarkably reducing the amount of sulfuric acid to be used and, at the same time, capable of controlling the gelling time of water-glass grouted into ground. SOLUTION: An aqueous solution of water-glass and an aqueous solution of a curing agent are used as the chemical to be grouted as a mixture into ground, and an inorganic acid and aluminum sulfate and/or polyaluminum chloride are used as the curing agent. It is preferred that per mol Na2O in the water-glass, 0.7-1.0 mol sulfuric acid is used and 0.002-0.14 mol aluminum sulfate and/or polyaluminum chloride [which is in terms of Al(OH)1.5Cl1.25(SO4)0.125] is used as the curing agent. |
